engine INFINITI QX56 2010 Factory Service Manual

TM-156
< ON-VEHICLE MAINTENANCE >
STALL TEST
4. Engine start, apply foot brake, and place selector lever in “D”
position.
5. While holding down the foot brake, gradually press down the accelerator pedal.
6. Quickly read off the stall speed, then quickly remove your foot from the accelerator pedal.
CAUTION:
Do not hold down the accelerator pedal for more than 5 sec-
onds during this test.
7. Move the selector lever to the “N” position.
8. Cool down the ATF. CAUTION:
Run the engine at idle for at least one minute.
Judgment of Stall Test
O: Stall speed within standard value position
H: Stall speed higher than standard value
L: Stall speed lower than standard value
Stall test standard value position
Stall speed: 2,550 - 2,850 rpm
SAT514G
Selector lever position
Expected problem location
DR
Stall rotation HO
• Forward brake
• Forward one-way clutch
• 1st one-way clutch
• 3rd one-way clutch
O H • Reverse brake
L L • Engine and torque converter one-way clutch
H H • Line pressure low
Does not shift-up “D” position 1 → 2 Slipping in 2GR, 3GR, 4GR Direct clutch slippage
Does not shift-up “D” position 2 → 3 Slipping in 3GR, 4GR, 5GR High and low reverse clutch slippage
Does not shift-up “D” position 3 → 4 Slipping in 4GR, 5GR Input clutch slippage
Does not shift-up “D” position 4 → 5 Slipping in 5GR Front brake slippage
Revision: April 20092010 QX56

LINE PRESSURE TESTTM-157
< ON-VEHICLE MAINTENANCE >
CEF
G H
I
J
K L
M A
B
TM
N
O P
LINE PRESSURE TEST
Inspection and JudgmentINFOID:0000000005148727
LINE PRESSURE TEST
Line Pressure Test Port
Line Pressure Test Procedure
1. Inspect the amount of engine oil and replenish if necessary.
2. Drive the car for about 10 minutes to warm it up so that the ATF reaches in range of 50 to 80 °C (122 to
176° F), then inspect the amount of ATF and replenish if necessary.
NOTE:
The automatic fluid temperature rises in range of 50 to 80 °C (122 to 176° F) during 10 minutes of
driving.
3. After warming up remove the oil pressure detection plug and install the Tool.
CAUTION:
When using the oil pressure ga uge, be sure to use the O-
ring attached to the oil pressure detection plug.
4. Securely engage the parking brake so that the tires do not turn.
SCIA2187E
SCIA5309E
SCIA1224E
Revision: April 20092010 QX56

TM-158
< ON-VEHICLE MAINTENANCE >
LINE PRESSURE TEST
5. Start the engine, then measure the line pressure at both idle andthe stall speed.
CAUTION:
• Keep the brake pedal pressed all the way down duringmeasurement.
• When measuring the line pressure at the stall speed, refer
to TM-155, "
Inspection and Judgment".
6. After the measurements are complete, install the oil pressure detection plug and tighten to the regulation torque below.
CAUTION:
Do not reuse the O-ring.
Line Pressure
Judgement of Line Pressure Test
Oil pressure detection
plug :7.3 N·m (0.74 kg-m, 65 in-lb)SAT493G
Engine speed
Line pressure [kPa (kg/cm
2, psi)]
“R” position “D” position
At idle speed 425 - 465 (4.3 - 4.7, 62 - 67) 379 - 428 (3.9 - 4.4, 55 - 62)
At stall speed 1,605 - 1,950 (16.4 - 19.9, 233 - 283) 1,310 - 1,500 (13.4 - 15.3, 190 - 218)
Judgement Possible cause
Idle speed Low for all positions
(P, R, N, D)
Possible causes include malfunctions in the pressure supply system and low oil pump output.
For example
•Oil pump wear
• Pressure regulator valve or plug sticking or spring fatigue
• Oil strainer ⇒ oil pump
⇒ pressure regulator valve passage oil leak
• Engine idle speed too low
Only low for a spe-
cific position Possible causes include an oil pressure leak in a passage or device related to the position after
the pressure is distributed by the manual valve.
High Possible causes include a sensor malfunction or malfunction in the line pressure adjustment func-
tion.
For example
• Accelerator pedal position signal malfunction
• ATF temperature sensor malfunction
• Line pressure solenoid malfunction (sticking in “OFF” state, filter clog, cut line)
• Pressure regulator valve or plug sticking
Sta ll sp ee d Oil pressure does
not rise higher than
the oil pressure for
idle.
Possible causes include a sensor malfunction or malfunction in the pressure adjustment function.
For example
• Accelerator pedal position signal malfunction
• TCM breakdown
• Line pressure solenoid malfunction (shorting, sticking in“ ON” state)
• Pressure regulator valve or plug sticking
• Pilot valve sticking or pilot filter clogged
The pressure rises,
but does not enter
the standard posi-
tion. Possible causes include malfunctions in the pressure supply system and malfunction in the pres-
sure adjustment function.
For example
• Accelerator pedal position signal malfunction
• Line pressure solenoid malfunction (sticking, filter clog)
• Pressure regulator valve or plug sticking
• Pilot valve sticking or pilot filter clogged
Only low for a spe-
cific position Possible causes include an oil pressure leak in a passage or device related to the position after
the pressure is distributed by the manual valve.
Revision: April 20092010 QX56

ROAD TESTTM-159
< ON-VEHICLE MAINTENANCE >
CEF
G H
I
J
K L
M A
B
TM
N
O P
ROAD TEST
DescriptionINFOID:0000000005148728
ROAD TEST
• The road test inspects overall performance of the A/T and analyzes possible malfunction causes.
• The road test is carried out in the following three stages.
1. Check before engine is started. Refer to TM-159
.
2. Check at idle. Refer to TM-159
.
3. Cruise test • Inspect all the items from Part 1 to Part 3. Refer to TM-160
, TM-162, TM-162.
• Before beginning the road test, check the test procedure and inspection items.
• Test all inspection items until the symptom is uncov ered. Diagnose NG items when all road tests are com-
plete.
Check Before Engine Is StartedINFOID:0000000005148729
1.CHECK AT CHECK INDICATOR LAMP
1. Park vehicle on level surface.
2. Move selector lever to “P” position.
3. Turn ignition switch to “OFF” position and wait at least 10 seconds.
4. Turn ignition switch to “ON” position. (Do not start engine.)
Does AT CHECK indicator lamp light up for about 2 seconds?
YES >> 1. Turn ignition switch to “OFF” position. 2. Carry out the self-diagnostics and record all NG items on the diagnostics worksheet. Refer toTM-32, "
CONSULT-III Function (TRANSMISSION)".
3. Go to TM-159, "
Check At Idle".
NO >> Stop the road test and go to TM-121, "
Symptom Table".
Check At IdleINFOID:0000000005148730
1.CHECK STARTING THE ENGINE
1. Park vehicle on level surface.
2. Move selector lever to “P” or “N” position.
3. Turn ignition switch to “OFF” position.
4. Turn ignition switch to “START” position.
Does the engine start?
YES >> GO TO 2.
NO >> Stop the road test and go to TM-121, "
Symptom Table".
2.CHECK STARTING THE ENGINE
1. Turn ignition switch to “ON” position.
2. Move selector lever in “D”,“4”, “3”, “2”, “1” or “R” position.
3. Turn ignition switch to “START” position.
Does the engine start in either position?
YES >> Stop the road test and go to TM-121, "Symptom Table".
NO >> GO TO 3.
3.CHECK “P” POSITION FUNCTIONS
1. Move selector lever to “P” position.
2. Turn ignition switch to “OFF” position.
3. Release the parking brake.
4. Push the vehicle forward or backward.
5. Engage the parking brake.
When you push the vehicle with disengaging the parking brake, does it move?
Revision: April 20092010 QX56

TM-160
< ON-VEHICLE MAINTENANCE >
ROAD TEST
YES >> Record the malfunction, GO TO 4.
NO >> GO TO 4.
4.CHECK “N” POSITION FUNCTIONS
1. Start the engine.
2. Move selector lever to “N” position.
3. Release the parking brake.
Does vehicle move forward or backward?
YES >> Record the malfunction, GO TO 5.
NO >> GO TO 5.
5.CHECK SHIFT SHOCK
1. Engage the brake.
2. Move selector lever to “D” position.
When the transmission is shifted from
“N” to “D”, is there an excessive shock?
YES >> Record the malfunction, GO TO 6.
NO >> GO TO 6.
6.CHECK “R” POSITION FUNCTIONS
1. Engage the brake.
2. Move selector lever to “R” position.
3. Release the brake for 4 to 5 seconds.
Does the vehicle creep backward?
YES >> GO TO 7.
NO >> Record the malfunction, GO TO 7.
7.CHECK “D” POSITION FUNCTIONS
Inspect whether the vehicle creeps forward when the transmission is put into the “D” position.
Does the vehicle creep forward in the
“D” positions?
YES >> Go to TM-160, "Cruise Test - Part 1".
NO >> Record the malfunction and go to TM-160, "
Cruise Test - Part 1".
Cruise Test - Part 1INFOID:0000000005148731
1.CHECK STARTING OUT FROM D1
1. Drive the vehicle for about 10 minutes to warm up the engine oil and ATF. Appropriate temperature for the ATF: 50 - 80° C (122 - 176°F)
2. Park the vehicle on a level surface.
3. Move selector lever to “P” position.
4. Start the engine.
5. Move selector lever to “D” position.
6. Press the accelerator pedal about half way down to accelerate the vehicle.
With CONSULT-III
Read off the gear positions.
Starts from D1?
YES >> GO TO 2.
NO >> Record the malfunction, GO TO 2.
2.CHECK SHIFT-UP D1 → D2
Press down the accelerator pedal about half way and inspect if the vehicle shifts up (D1 → D2) at the appropri-
ate speed.
• Refer to TM-265, "
Vehicle Speed at Which Gear Shifting Occurs".
With CONSULT-III
Read the gear position, throttle degree of opening, and vehicle speed.
Does the A/T shift-up D1
→ D2 at the correct speed?
YES >> GO TO 3.
NO >> Record the malfunction, GO TO 3.
Revision: April 20092010 QX56

TM-162
< ON-VEHICLE MAINTENANCE >
ROAD TEST
With CONSULT-III
Read the gear position and engine speed.
When the A/T shift-down D5
→ D4, does the engine speed drop smoothly back to idle?
YES >> 1. Stop the vehicle. 2. Go to TM-162, "
Cruise Test - Part 2".
NO >> Record the malfunction and go to TM-162, "
Cruise Test - Part 2".
Cruise Test - Part 2INFOID:0000000005148732
1.CHECK STARTING FROM D1
1. Move selector lever the “D” position.
2. Accelerate at half throttle. With CONSULT-III
Read the gear position.
Does it start from D1?
YES >> GO TO 2.
NO >> Record the malfunction, GO TO 2.
2.CHECK SHIFT-UP D1 → D2
Press the accelerator pedal down all the way and ins pect whether or not the transmission shifts up (D1 → D2)
at the correct speed.
• Refer to TM-265, "
Vehicle Speed at Which Gear Shifting Occurs".
With CONSULT-III
Read the gear position, throttle position and vehicle speed.
Does the A/T shift-up D1
→ D2 at the correct speed?
YES >> GO TO 3.
NO >> Record the malfunction, GO TO 3.
3.CHECK SHIFT-UP D2 → D3
Press the accelerator pedal down all the way and ins pect whether or not the transmission shifts up (D2 → D3)
at the correct speed.
• Refer to TM-265, "
Vehicle Speed at Which Gear Shifting Occurs".
With CONSULT-III
Read the gear position, throttle position and vehicle speed.
Does the A/T shift-up D2
→ D3 at the correct speed?
YES >> GO TO 4.
NO >> Record the malfunction, GO TO 4.
4.CHECK SHIFT-UP D3 → D4 AND ENGINE BRAKE
When the transmission changes speed D3 → D4, return the accelerator pedal.
Does the A/T shift-up D3
→ D4 and apply the engine brake?
YES >> 1. Stop the vehicle. 2. Go to TM-162, "
Cruise Test - Part 3".
NO >> Record the malufunction and go to TM-162, "
Cruise Test - Part 3".
Cruise Test - Part 3INFOID:0000000005148733
1.CHECK SHIFT-DOWN
During D
5 driving, move gear selector from D → 4 → 3 → 2 → 1.
With CONSULT-III
Read the gear position.
Is downshifting correctly performed?
YES >> GO TO 2.
NO >> Record the malfunction, GO TO 2.
2.CHECK ENGINE BRAKE
Revision: April 20092010 QX56

ROAD TESTTM-163
< ON-VEHICLE MAINTENANCE >
CEF
G H
I
J
K L
M A
B
TM
N
O P
Check engine brake.
Does engine braking effectively reduce speed in 1
1 position?
YES >> Check malfunction phenomena to repair or replace malfunctioning part. Refer to TM-121, "Symp-
tom Table".
NO >> 1. Record the malfunction. 2. Check malfunction phenomena to repair or replace malfunctioning part. Refer to TM-121,
"Symptom Table".
Vehicle Speed When Shifting GearsINFOID:0000000005148734
Refer to TM-265, "Vehicle Speed at Which Gear Shifting Occurs".
Vehicle Speed When Performing and Releasing Complete Lock-upINFOID:0000000005148735
Refer to TM-266, "Vehicle Speed at Which Lock-up Occurs/Releases".
Revision: April 20092010 QX56

TM-164
< ON-VEHICLE MAINTENANCE >
A/T POSITION
A/T POSITION
Adjustment of A/T PositionINFOID:0000000005148736
1. Loosen nut of control cable.
2. Place the manual lever and selector lever in “P” position.
3. Push the control cable in the direction shown with a force of 9.8
N (1kg, 2.2 lb), and release it. This is in the natural state, tighten
control cable nut to specifications.
Checking of A/T PositionINFOID:0000000005148737
With the selector lever in the “P” position, turn t he ignition switch to the ON position with the engine OFF.
Confirm that the following conditions apply.
• The selector lever can be shifted from the “P” position only when the brake pedal is depressed.
• The selector lever stops at each position with the f eel of engagement when it is moved through all the posi-
tions.
• There is no excessive effort, sticking, noise or rattle.
• The actual position of the selector lever matches the position shown by the shift position indicator and the A/
T body.
• The back-up lamps illuminate only when the selector lever is placed in the “R” position.
• The back-up lamps do not illuminate when the selector lever is pushed against the “R” position when in the “P” or “N” position.
• The engine can only be started with the select or lever in the “P” and “N” positions.
• The A/T is locked completely when in the “P” position. Control cable nut : 14.5 N·m (1.5 kg-m, 11 ft-lb)
SCIA6532E
Revision: April 20092010 QX56

TM-186
< REMOVAL AND INSTALLATION >
TRANSMISSION ASSEMBLY
REMOVAL AND INSTALLATION
TRANSMISSION ASSEMBLY
Removal and Installation (2WD)INFOID:0000000005148743
COMPONENTS
REMOVAL
CAUTION:
When removing the A/T assembly from engine, first remove the crankshaft position sensor (POS) from
the A/T assembly.
Be careful not to damage sensor edge.
1. Disconnect the negative battery terminal.
2. Remove A/T fluid level gauge.
3. Partially drain A/T fluid. Refer to TM-150, "
Changing the A/T Fluid (ATF)".
4. Remove engine under covers using power tool.
5. Remove exhaust front tube and center muffler using power tool. Refer to EX-6, "
Exploded View".
6. Remove rear propeller shaft. Refer to DLN-196, "
Removal and Installation".
7. Disconnect A/T shift selector cable.
1. A/T fluid charging pipe 2. A/T fluid level gauge 3. O-ring
4. Transmission assembly 5. Fluid cooler tube6. A/T cross member
7. Insulator 8. Copper washers
AWDIA0553GB
Revision: April 20092010 QX56

TRANSMISSION ASSEMBLYTM-187
< REMOVAL AND INSTALLATION >
CEF
G H
I
J
K L
M A
B
TM
N
O P
8. Remove crankshaft position sens or (POS) from A/T assembly.
CAUTION:
• Do not subject it to impact by dropping or hitting it.
• Do not disassemble.
• Do not allow metal filings or foreign material to get on the
sensor front edge magnetic area.
• Do not place in an area affected by magnetism.
9. Remove fluid cooler tube.
10. Remove dust cover from converter housing.
11. Turn crankshaft to access and remove the four bolts for drive plate and torque converter.
CAUTION:
When turning crankshaft, turn it clockwise as viewed from
the front of the engine.
12. Support A/T assembly with a transmission jack. CAUTION:
When setting the transmission jack, be careful not to allow
it to collide agai nst the drain plug.
13. Remove cross member using power tool.
14. Remove air breather hose. Refer to TM-166, "
Removal and
Installation".
15. Disconnect A/T assembly connector.
16. Remove A/T fluid charging pipe from A/T assembly.
17. Plug any openings such as the A/T fluid charging pipe hole.
18. Remove the A/T assembly to engine bolts using power tool.
19. Remove A/T assembly from vehicle using transmission jack. CAUTION:
• Secure torque converter to prevent it from dropping.
• Secure A/T assembly to a transmission jack.
INSPECTION
Installation and Inspection of Torque Converter
• After inserting a torque converter to a transmission, be sure to check distance A to ensure it is within specifications.
INSTALLATION
Installation of the remaining components is in the revers e order of the removal, while paying attention to the
following:
LCIA0334E
LCIA0335E
SCIA0499E
Distance A : 24.0 mm (0.94 in) or more
SAT017B
Revision: April 20092010 QX56